Hello, I am new here in this mailing list and want to introduce myself.
My name is Maik Justus, I am living in Bielefeld (Germany) and one of my hobbys is rc-model flying, especially helicopters. I am an physicist and have now some time after Ph.D. and before first job... About 10 years ago I've programmed most parts of "Das Hexagon Kartell", a helicopter flight simulator, but only sold in Germany. (I did the flight model, most parts of the graphics engine, video compression, 3D tools, etc.) In normal flying it is quite realistic, but you can drive it into "strange" behavior. I developed the flight model on a 386 completely with integers to speed up the code. To get faster code some simplifications of the physic and mathematics were necessary, which results in the partly unrealistic behavior. It only can simulate jointless rotors (as on the Bo105, BK117), but with some cheats other rotors systems worked not so bad. A short time ago I found flightgear in the net, but without helicopter flight model. I looked in the code, if it is complicate to put in a heli flight model for myself. I decided to extend the yasim flight model. I added a "rotor" statement, so that you can add one or more rotor(s). The "wing" and "hstab" are now optional (if they are missing the solver is not invoked and fixed values (from the 172) are taken. I added a "mstab" statement, for "mirrored stab", so exactly the same as "wing" but not effected by the solver. It should be possible to simulate every helicopter with fixed rotor mast (sorry to the ospray (or is it named osprey?) fans). The model feels quite realistic, but I can not really judge or optimize the settings because I am only a rc-model helicopter pilot. Some simplifications are made in the model, but I hope that they have no effect to the realism. I have some detailed information's about the BO105, so I tried to simulate its rotor head. Simultaneously I try a Bell206 like rotor (which is much harder to fly with), but I have not enough data for this helicopter now. Some details are still missing (i.e. rho of the air is ignored, and the rotor is not producing any torque), but this will be added soon (the torque will be switch able). Also missing is the engine, the rotor-RPMs are fixed up to now. Probably there are some bugs, maybe a sign somewhere or a knot in my brain developing the formulas (the mix between metric and English units was also not very helpful). By the way, the documentation is mostly drawn on paper... So there is still some work, but if someone want to have this (alpha-)source just let me know where to mail it (but let me first search for bugs a few days...). The changes are based on the 0.9.2 Version (I hope, that there are not so many differences to the development Version). What I could need is a helicopter (the 3D-Model), the c172 looks a little bit strange when flying like an helicopter. It would be helpful, if the angle of the Rotor blades (to the mast) would be visible. The flight model puts out this angle for 4 positions (front, right, back, left). Maik _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
